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Solve the following system of equations.

X + 8y = 5 (1)
x=8-8y (2)

put the second in standard format.

x+8y=8
but the first is
x+8y=5
so the equations are not independent, they are in fact parallel lines, and have no solution where they cross.

that is
x + 8 y = 5
and
x + 8 y = 8

These are two parallel lines which never intersect, no solution possible.

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